Manuale d’uso / di manutenzione del prodotto SRG50 del fabbricante Nortel
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BCM50 3 .0 Surviv able R emot e Gat e wa y Docume nt S tatus: St andard Document Number : NN40140-500 Document V ersion : 02.03 Date: J une 2008 SRG50 C on figur ation Guide.
Copyright © 2006–2008 Nort el Netw orks, All Rights Reser ved All rights reserved. The information in this document is subj ect to change without notic e. The statements, configur ations, techni cal data, and recommendations in this document are belie ved to be accurate and re liable, but are presented wi thout express or implied warranty .
3 SRG50 Configuration Guide Task List Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 SRG50 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 NN40140-500 NN40140-500.
5 SRG50 Configuration Guide Contents Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 About this g uide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 NN40140-500 NN40140-500 Network Band width Managem ent (NBWM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Adaptive Net work Bandwidt h Manageme nt (ADBWM) . . . . . . . . . . . . . . . . . . . . . 39 Alternative Call R outing (ACR) .
7 SRG50 Configuration Guide Main office information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 External atte ndant support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 NN40140-500 NN40140-500.
9 SRG50 Configuration Guide Chapter 1 Getting started About this guide The SRG50 Configuration Guide describes how to install, config ure, and maintain the Survivable Remote Gateway (SRG) 50 Release 3.0. The SRG50 is positioned as a cost-effective Sma ll IP Branch Office solution for CS 1000 Main office systems.
10 Chapter 1 Getting starte d NN40140-500 NN40140-500 BARS Basic alter nate route selection BUID Branch user ID CDP Coordinated d ialing plan DDIM Digital drop and inser t mux DN Director y number DSC.
Chapter 1 Getting starte d 11 SRG50 Configuration Guide Symbols and con ventions used in this guide These symbols highlight critical information for the SRG system. These conventions and symbols represent th e Business Series Terminal display and dialpad.
12 Chapter 1 Getting starte d NN40140-500 NN40140-500 These text co nventions a re used in thi s gui de to indicate the information described. Related publications This section provides a list of addition al documents re ferred to in this guide.
Chapter 1 Getting starte d 13 SRG50 Configuration Guide How to get help This section explains how to get help fo r Nortel products and services. Getting Help from the Nortel Web site The best way to get technical support for Nortel products is from the No rtel Technical Support Web site: http://www .
14 Chapter 1 Getting starte d NN40140-500 NN40140-500.
15 SRG50 Configuration Guide Chapter 2 SRG50 overview The SRG50 is a software application that leve rages the BCM50 platform. It is optimized to provide feature transparency to th e main offic e call server and to act as a survival remote gateway in a CS 1000 IP branch office environment.
16 Chapter 2 SRG50 overview NN40140-500 NN40140-500 SRG50 creation An SRG50 is created b y applying the approp riate SRG keycode to a functional BCM50 system. SRG50 is only supporte d on the BCM50 and BCM50b main units. Integrate d router versions of the BCM50 (BCM 50a, BCM50e, BCM 50ba, and BCM50be) do not su pport the SRG50 application.
Chapter 2 SRG50 overview 17 SRG50 Configuration Guide SRG50 ke ycode activ ation To create an SRG50, use Element Manager to activate the SRG keycode on a BCM50 system (BCM50 or BCM50b main unit). To activate the SRG keycode 1 Locate the SRG author ization codes supplied with your product.
18 Chapter 2 SRG50 overview NN40140-500 NN40140-500 To reboot the system 1 In Element Manager , na vigate to the Reset panel (Administration > Utilities > Reset ).
Chapter 2 SRG50 overview 19 SRG50 Configuration Guide Suppor ted de vices The SRG50 Release 3.0 supports: • IP Phones 1110, 11 20E, and 1140E • IP Phone 2001 , 2002, 2004, 20 07, and 2033 • IP Phone K ey Expansion Module (KEM) – The IP Phon e KEM is supported on an SRG with normal mode IP Phon es.
20 Chapter 2 SRG50 overview NN40140-500 NN40140-500 SRG50 terminolog y The table SRG50 terminology on page 20 identifies SRG terms that may be unfamiliar to main office installers. They are provided to facilita te communications between SRG and main office personnel.
Chapter 2 SRG50 overview 21 SRG50 Configuration Guide Coor dination with the main office call ser ver Configuration of the SRG branch office requires datafill at both the SRG and the main office call server.
22 Chapter 2 SRG50 overview NN40140-500 NN40140-500 Figure 1 Normal mode IP telephones conn ected at the SRG are registered with the main office call server and are unde r main office control.
Chapter 2 SRG50 overview 23 SRG50 Configuration Guide Local mode In the event of a WAN failure or the call server at the main office be comes una vailable, the IP Phones in normal mode revert to local mode automatical ly. In loca l mode, the IP users connected to the SRG are under the control of th e SRG.
24 Chapter 2 SRG50 overview NN40140-500 NN40140-500 Automatic registration with the main office When configured as a branch office user set, an IP telephone at the SRG au tomatically attempts to regis.
Chapter 2 SRG50 overview 25 SRG50 Configuration Guide The figure Process map for installing and configuring an SRG on page 26 provides a process map for installing and configuring an SRG50.
26 Chapter 2 SRG50 overview NN40140-500 NN40140-500 Pr ocess map for installing and configuring an SRG Figure 3 Process map for installing and configuring an SRG Locate the BCM50 that will be conv er ted to the SRG.
27 SRG50 Configuration Guide Chapter 3 Task summary The task summary offers a high le vel, chronological review of the tasks required to configure the SRG50. The paths ( Xxxx > Yyyy > Zzzz ) direct you to the appropri ate Business Element Manager (Element Manager) panels.
28 Chapter 3 Task summary NN40140-500 NN40140-500 iii) For calls coming in from the priv ate network Conf iguration > T elephony > Dialing Plan > Private Network > Dialin g Plan - Priv ate.
Chapter 3 Task summary 29 SRG50 Configuration Guide 3 Configure the IP telephone codec and jitter settings. Conf iguration > Resources > T elephony Resources > IP Sets ro w > Details f or .
30 Chapter 3 Task summary NN40140-500 NN40140-500 2 Configure V o IP trunk QoS settings. Conf iguration > Resources > T elephony Reso urces > Modules pan el > IP T runks row > H323 Medi.
Chapter 3 Task summary 31 SRG50 Configuration Guide Call r outing configuration 1 Decide on the fallback scheme. Internal Reference: Fallback conf iguration on page 72 2 Configure the outgoing routes (V oIP an d PSTN fallback).
32 Chapter 3 Task summary NN40140-500 NN40140-500.
Chapter 4 CS 1000 considerat ions 33 SRG50 Configuration Guide Chapter 4 CS 1000 considerations A Survivable Remote Gateway (SRG) extends CS 10 00 features from the main office and provides a business continuity sol ution to one or more remote SRG locatio ns (branch offices).
34 Chapter 4 CS 1000 considerations NN40140-500 NN40140-500 DN (director y number) The dialable number of a telephone at the main office when it is called from another phone at the main office. DN (director y number) The dialable number of a telephone at the SRG when it is called from another phone at the SRG.
Chapter 4 CS 1000 considerat ions 35 SRG50 Configuration Guide Normal and local mode o ver view Normal mode and local mo de overview provid es a description of th e following sections: • “Normal m.
36 Chapter 4 CS 1000 considerations NN40140-500 NN40140-500 services, such as transfer, last number redial, and single ke y access through the PSTN to a centralized voice messaging sy stem are supported. Local PSTN access and local Emergency Services access is also supported.
Chapter 4 CS 1000 considerat ions 37 SRG50 Configuration Guide If the main office Signaling Server fails and an Alternate Signaling Server is available, the SRG IP Phones reset and reregister with the SRG. The SRG will then query the NCS for the Alternat e Signaling Server’s IP address.
38 Chapter 4 CS 1000 considerations NN40140-500 NN40140-500 Vir tual trunk capacity The SRG supports a number o f simultaneous calls depends on the spec ific codec type used. SRG50 supports 24 virtual IP t runks that are eith er H.323 only, SIP only, or a combination of the H.
Chapter 4 CS 1000 considerat ions 39 SRG50 Configuration Guide Netw ork Bandwidth Management (NBWM) The SRG interoperates with the Network Bandwi dth Management (NBWM) fea ture in a manner similar to Media Gateway (MG) 100 0B, though only G.711 an d G.
40 Chapter 4 CS 1000 considerations NN40140-500 NN40140-500 Bandwidth mana g ement configuration: NBWM, ADBWM, and AC R To configure SRG for NBWM and ADBWM 1 Obtain the V irtual Pri vate Network ID and the Zo ne ID numbers configured at the main off ice.
Chapter 4 CS 1000 considerat ions 41 SRG50 Configuration Guide 3 Define a route to the main of fice Attendant o ver the PSTN. a Access the Dialing Plan - Routing panel ( Configuration > T elephony > Dialing Plan > Routing ) and select the Routes tab .
42 Chapter 4 CS 1000 considerations NN40140-500 NN40140-500 c Ensure that the DN T ype is Public (Unknown) . d In the External Number f ield, enter the NP A-NXXX of the DID trunks that serve the ma i n offi c e . e Assign the PSTN line pool to the ro ute (select the line pool from the Use P o ol list; default is A ).
Chapter 4 CS 1000 considerat ions 43 SRG50 Configuration Guide To configure Emerge ncy Services Access 1 V erify that a remote access pa ckage has be en assigned to the V oIP trunks (see Remote Access Package for V oIP trunks o n page 76). 2 Obtain the ESA Special Number (SPN).
44 Chapter 4 CS 1000 considerations NN40140-500 NN40140-500 CS 1000 inf ormation for the SRG In order to redirect IP telephon es and forward calls to the main office (Call Forward All Calls feature), the SRG requires information about the main office network environment.
Chapter 4 CS 1000 considerat ions 45 SRG50 Configuration Guide H323 ID SRG* (default) *This setting must be ch anged. see the Networking Co nfiguration Guide (NN40020-6 03) f or naming conv entions.
46 Chapter 4 CS 1000 considerations NN40140-500 NN40140-500 To datafill the S1000 Main Office Settings panel 1 In Element Manager , navig ate to Conf iguration > Resources > Surv ivable Remote Gateway (see the figure S1000 Main Of f ice Settings panel on page 46).
Chapter 4 CS 1000 considerat ions 47 SRG50 Configuration Guide IP telephones redirection Once an IP telephone at the SRG is configured (see IP telephones setup and configuration on page 53), it automatically registers with the SRG (S1). To configure an IP tele phone for redirection to the main office call server, SRG-specific datafill is required.
48 Chapter 4 CS 1000 considerations NN40140-500 NN40140-500 S1000 IP T erminal Details panel Element Manager pr ovides SRG-specific pa nels fo r recording the CS 1000 TN and BUID that are associated with a particular SRG DN.
Chapter 4 CS 1000 considerat ions 49 SRG50 Configuration Guide To enter the MOTN an d BUID 1 In Element Manager , na vigate to Conf iguration > Resour ces > Survi vable Remote Gateway . 2 Select the S1000 IP T erminal Details tab (see the figure S1000 IP T erminal Details panel on page 50).
50 Chapter 4 CS 1000 considerations NN40140-500 NN40140-500 Figure 6 S1000 IP T erminal Details panel IP telephone settings For IP telephones that are redirected to the main office call server, incorp orate the settings shown in the table Configuration settings for redirected IP Phones on page 50.
Chapter 4 CS 1000 considerat ions 51 SRG50 Configuration Guide Firmware upgrade The redirected IP telephones at the SRG are under the control of the main office call server for the majority of their deployment and receive all of thei r features in th at contex t.
52 Chapter 4 CS 1000 considerations NN40140-500 NN40140-500.
53 SRG50 Configuration Guide Chapter 5 IP telephones setup and configuration IP telephone setup and DN configurat ion are described in detail in the IP Telephone Installa tion and Configuration Guide and the Networking Configuration Guide (NN40020-603), respectively.
54 Chapter 5 IP telephones setu p and configura tion NN40140-500 NN40140-500 There are three fields that def ine the pa ssword re gistration process (see the table Pas swo rd registration parameters on p age 54): Enable registration , Enable global registration password , and Global p assword .
Chapter 5 IP telephones setup and configurat ion 55 SRG50 Configuration Guide Local mode indication When an IP telephone is in local mode, a message is displayed on the ph one to indicate the local mode state to the user. The default setting is Local Mode .
56 Chapter 5 IP telephones setu p and configura tion NN40140-500 NN40140-500 Figure 8 Modules panel, IP & Application Sets T elephone (DN) recor ds configuration DN records for IP telephones are configured through the All DNs panel ( Conf iguration > T elephony > Sets > All DNs (see the figure All DNs panel on page 58).
Chapter 5 IP telephones setup and configurat ion 57 SRG50 Configuration Guide 5 From the Model list, select the model of telephone assigned to this DN. For CS 1000 : See IP telephones numbers and models on page 47. 6 T o support outgoing caller ID ov er the V oIP trunk, the Pri vate OLI f ield ( Priv .
58 Chapter 5 IP telephones setu p and configura tion NN40140-500 NN40140-500 Figure 9 All DNs panel 13 Select the Capabilities and Pr eferences tab . 14 In the Intercom keys column, set Intercom K eys to 1 if required. 15 On the Details for DN subpanel, select the Button Pr ograming T able tab .
Chapter 5 IP telephones setup and configurat ion 59 SRG50 Configuration Guide Received number s configuration The Public Received number length and the Private Received number length (see Basic parameters on page 67) determine the nu mber of dig its that the SRG retains for call processing.
60 Chapter 5 IP telephones setu p and configura tion NN40140-500 NN40140-500 DHCP settings configuration To configure DHCP sett ings for SRG operation 1 In Element Manager , na vigate to Conf iguration > Data Servi ces > DHCP Server . 2 Select the General Settings tab .
Chapter 5 IP telephones setup and configurat ion 61 SRG50 Configuration Guide The disadv antage of the second option is th at the installer must conf igure the tar get DN in two places: on the Activ e Sets panel and on the SRG-specific p anels (the SRG-specific panels must be completed).
62 Chapter 5 IP telephones setu p and configura tion NN40140-500 NN40140-500 To exit Test Local Mode (a nd return to Normal Mode) Generally, you exit Test Local Mode by waiting for the feature to time out or by pressing the Exit key ( ). This key is active only when th e telephone is in th e local mode test.
Chapter 5 IP telephones setup and configurat ion 63 SRG50 Configuration Guide • Held line reminder If set to a time, determines pe riod between when a call is pu t on hold and when a short tone sounds at the telephone to indicate the call is still on hold.
64 Chapter 5 IP telephones setu p and configura tion NN40140-500 NN40140-500.
65 SRG50 Configuration Guide Chapter 6 Setting up the private VoIP network To provide SRG functionalit y and to take advantage of VoIP techn ology, a private VoIP network is required between the SRG an d the main office .
66 Chapter 6 Setting up the private VoI P network NN40140-500 NN40140-500 Figure 12 V oIP path f or SRG operatio n Generic procedures for setting up a privat e network on the SRG are covered in the Networking Configuration Guide (NN40020-603 ).
Chapter 6 Setting up the private VoI P network 67 SRG50 Configuration Guide Basic parameters The table Basic parameters on page 67 provides a record of basic parameters that are signif icant for SRG operation.
68 Chapter 6 Setting up the private VoI P network NN40140-500 NN40140-500 Priv ate dialing plan For SRG operation, either a coordina ted dialing plan (CDP) or a uniform dialing p lan (UDP) can be configured. Nortel recommends CDP because it requires the least dialing manipulation between the SRG and the main office call server.
Chapter 6 Setting up the private VoI P network 69 SRG50 Configuration Guide Figure 13 Dialing Plan — Priv ate Network panel, Priv ate Network Settings subpanel Meridian Customer Defined Netw ork (MCDN) MCDN is automatically activated when the system is converted to SRG opera tion.
70 Chapter 6 Setting up the private VoI P network NN40140-500 NN40140-500 Figure 14 Dialing Plan — Priv ate Network panel, MCDN su bpanel QoS settings (codec, jitter b uffer , and related items) Qua.
Chapter 6 Setting up the private VoI P network 71 SRG50 Configuration Guide In Element Manager, enter QoS settings for VoIP trunks throug h the Telephony Resources panel. To enter the QoS settings for VoIP trunks 1 In Element Manager , na vigate to Conf ig uration > Resources > T elephony Resources .
72 Chapter 6 Setting up the private VoI P network NN40140-500 NN40140-500 Netw ork security Firewall configuration for SRG is the same as for the BCM50 and is detailed in the Networking Configuration Guide (NN40020-603). Fire walls cannot be config ured to allow VoIP pass through.
Chapter 6 Setting up the private VoI P network 73 SRG50 Configuration Guide Gatekeeper r outing The gatekeeper routes the calls based on an intern al numbering table. Ensu re that the gatekeeper administrator has a list of the numbers that identify the SRG and the SRG PSTN.
74 Chapter 6 Setting up the private VoI P network NN40140-500 NN40140-500 When you set the valu e of the RFC2833 Dynamic Payloa d field, if the value is greater than 0, then this feature is enabled. If the feature is enabled then DTMF di gits are sent in RTP packets.
Chapter 6 Setting up the private VoI P network 75 SRG50 Configuration Guide c Change the schedule name (option al). In this procedure, the name SRG is used as the name of the schedule. d In the Services subpanel, select your schedule. e In the Routing Svc ro w for your schedule, select Au t o from the list.
76 Chapter 6 Setting up the private VoI P network NN40140-500 NN40140-500 h In the adjacent Absorbed Length field, select the number of digits to be absorbed. The Absorbed Length applies to the dig its of t he destination code only . i In the Second Route field, enter 999 (the PSTN route).
Chapter 6 Setting up the private VoI P network 77 SRG50 Configuration Guide PSTN destination co des configuration To allow SRG telephones to dial out over the PSTN and to allow main office telephones to tandem out through the local SRG PSTN, you need to define a destina tion code that accesses the PSTN line pool without an External Nu mber.
78 Chapter 6 Setting up the private VoI P network NN40140-500 NN40140-500 b Assign the Normal and SRG sche duled route for the two des tination codes. Main office inf ormation The SRG requires information abou t the main office call server th at is not needed for a BCM50.
79 SRG50 Configuration Guide Chapter 7 PSTN access and analog devices SRG-specific items relevant to PSTN trunks and analog devices include: • PSTN access considerations on page 79 • Analog device.
80 Chapter 7 PSTN access and analog devices NN40140-500 NN40140-500 • Access to system features Analog telephones do not have a Feature ke y . Ins tead, they use a Link (*) ke y to access system features.
Chapter 7 PSTN access and analog devices 81 SRG50 Configuration Guide If you want the analog telephones to emulate lo cal mode call functional ity always, assign only the PSTN line pool to the analog de vices. 9 Select the Capabilities and Pr eferences tab .
82 Chapter 7 PSTN access and analog devices NN40140-500 NN40140-500.
83 SRG50 Configuration Guide Chapter 8 Troubleshooting Potential problems, probable caus es, and suggested solutions for SRG-specific configuration and operating troubles are categori zed under the fo.
84 Chapter 8 Troubleshooting NN40140-500 NN40140-500 IP terminal details The table IP Terminal Details on page 84 summarizes the events that can be rais ed by the SRG. The events and details appear in Element Manager at Configuration > Telephony > Sets > Active Sets > IP Terminal Details.
Chapter 8 Troubleshooting 85 SRG50 Configuration Guide Pr obable causes f or redirection failure The IP telephone registration to th e main office call server can fail due to improper configuration or lack of WAN connectivity.
86 Chapter 8 Troubleshooting NN40140-500 NN40140-500 • The actual IP telephone set type at th e SRG does not match MO TN set type at the ma i n offi c e . • The user id is registered and not idle. • The user id entry in the gatekeeper data base points back to the originating node.
Chapter 8 Troubleshooting 87 SRG50 Configuration Guide 3 Click the Status tab to view the Status field. If Status displays Up, the con version was successful.
88 Chapter 8 Troubleshooting NN40140-500 NN40140-500.
89 SRG50 Configuration Guide Appendix A Telephone features in normal and local mode The information provided here is design ed for distribution to telephone u sers at the SRG.
90 Telephone featur es in normal and local mode NN40140-500 NN40140-500 • IP Phone 1120E in Local mode on page 91 • IP Phone 1140E in Local mode on page 91 • IP Phone 2001 in Local mode on page .
Telephone feat ures in normal and local mode 91 SRG50 Configuration Guide IP Phone 1120E in Local mode IP Phone 1140E in Local mode A u todials v oice mail through Exit/Quit k ey: only activ e if MO s.
92 Telephone featur es in normal and local mode NN40140-500 NN40140-500 IP Phone 2001 in Local mode IP Phone 2002 in Local mode DN: 345 Local mode Aug 6 9 :43 am Progr ammab le label A u todials v oic.
Telephone feat ures in normal and local mode 93 SRG50 Configuration Guide IP Phone 2004 in Local mode IP Phone 2007 in Local mode A ug 6 9:43 Local Mode T ransfer Lastnum 345 Programmab le label Not a.
94 Telephone featur es in normal and local mode NN40140-500 NN40140-500 IP Phone 2033 in Local mode Activ ate T est in L ocal A utodials v oice mail through Progr ammable label Local Mode.
Telephone feat ures in normal and local mode 95 SRG50 Configuration Guide IP 2050 Softphone in Local Mode A T A e xtension features Analog telephones can be connected to the system through analog station modules or by installing an Analog Termin al Adapter (ATA ) between the telephone and a digital station module.
96 Telephone featur es in normal and local mode NN40140-500 NN40140-500 Call Forw ard (e xter nal system) LINK *4 <dialed #> LINK 2 LINK #4 Pause LINK *78 Timed release LINK *72 Ring Again LINK .
97 SRG50 Configuration Guide Glossary BDP Both Dialing Plans. A dialing plan option that is sup port ed on the main of fice only . The SRG supports CDP or UDP only . If the main office is running BDP , the SRG zone must be configured to allow either CDP or UDP , not both.
98 Glossary NN40140-500 NN40140-500 main office, main office call server The system that provides teleph ony services to redirected SRG IP telephon es in normal mode. NCS Network Connection Serv er The NCS is an H.323 gatekeeper . It provid es standard H.
99 SRG50 Configuration Guide Inde x A adaptive network b andwidth management 39 alarm set 63, 87 alternative call routing 39 analog devices 79 B Bandwidth management zone 44 before you begin 9 block I.
100 NN40140-500 NN40140-500 MCDN network settings 69 MO Access Code Length 46 MO TPS 48 Modes of oper ation 21 MOTN 48 N network bandwi dth management 39 networking private dialing plan 68 no connecti.
101 SRG50 Configuration Guide VoIP trunks line configuration 74 MCDN network setting 69 remote package 76 SRG configuration 65.
102 NN40140-500 NN40140-500.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Nortel SRG50 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Nortel SRG50 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Nortel SRG50 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Nortel SRG50 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Nortel SRG50, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Nortel SRG50.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Nortel SRG50. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Nortel SRG50 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
